Wide-temperature-range gas-liquid phase change measuring device

Abstract

The invention discloses a wide temperature zone gas-liquid phase change measuring device, which comprises a channel steel substrate and a phase change measuring container, a radiation bottom shell, a temperature control system and a material conveying system are arranged on the channel steel substrate in parallel, and the top of the radiation bottom shell is detachably connected with a radiation end shell, the phase change measuring container is arranged in the middle of a closed space defined by a radiation bottom shell and a radiation end shell, a welding structure of a copper pipe and a copper plate is used as a heat sink directly surrounding the container, the heat conductivity coefficient is high, the heat capacity is large, the temperature response is fast, the cooling capacity / heat of a refrigerant (liquid nitrogen at the temperature of-173 DEG C or other low-temperature liquefied gas) can be evenly spread to the outer wall of the whole container, and the measurement accuracy is high. The vacuum interlayer thoroughly cuts off gas heat conduction, the columnar structure defined by the copper plates is similar to a suspension structure, thermal contact resistance is eliminated, long-term constant temperature can be achieved in low-temperature and high-temperature states, and extremely low-temperature accessibility and wide-temperature-range stability are really considered.

Description

Technical Field

[0001] This invention relates to a gas-liquid phase change measurement device, and more particularly to a wide-temperature-range gas-liquid phase change measurement device. Background Technology

[0002] Gas-liquid phase change measurement refers to the quantitative recording of macroscopic parameter changes during the entire process of a substance's transformation from a gaseous to a liquid state under specified temperature and pressure conditions. Typically, the evolution curves of temperature, pressure, volume (or density), mass, or dielectric / optical signals over time or heat are acquired simultaneously. This allows for the precise calibration of thermodynamic data such as saturated vapor pressure, boiling point, condensation point, latent heat, phase boundary density difference, and critical point, providing fundamental physical property data for fields such as liquid screening, heat engine cycle design, chemical separation, aerospace propellants, and cryogenic refrigeration. Chinese Patent Publication No. CN117517127A discloses a device and method for measuring the pressure limit of liquid nitrogen phase change expansion in a constant volume space. First, a calculation model is established. Liquid nitrogen is poured into a vacuum insulated cup. Utilizing the good insulation effect of the vacuum insulated cup, the liquid nitrogen is stabilized inside, thus accurately obtaining the volume of liquid nitrogen. The vacuum insulated cup is then placed in a high-pressure container. During testing, a rotating mechanism tilts the high-pressure container from a vertical to a horizontal position, causing the liquid nitrogen inside the vacuum insulated cup to rapidly flow out into the container for phase change expansion. The pressure obtained after stabilization is the pressure limit of the phase change expansion of that volume of liquid nitrogen. The entire process is implemented stably, ultimately enabling accurate measurement of the pressure limit of different volumes of liquid nitrogen in a constant volume space. The phase change expansion pressure limit within the volume is determined by comparing it with the data obtained from the calculation model to obtain the correction coefficient, thereby obtaining the corrected calculation model. This model is used to guide the required liquid nitrogen expansion pressure and the corresponding injection volume relationship when liquid nitrogen is used for actual coal seam permeability enhancement. The above technology involves pouring a known volume of liquid nitrogen into a vacuum thermos, then tilting the whole thing to flash vaporize it in a high-pressure autoclave, measuring a maximum pressure, and then stopping. It can only provide the limit pressure increase value for one direction and one temperature zone. It cannot cool down or heat up, nor can it perform continuous scanning to continuously record the PVTx curve of the gas-liquid phase change during the entire process of heating, cooling, pressurizing, and depressurizing, so as to obtain a complete set of thermodynamic data such as saturated vapor pressure, latent heat, and critical point. Summary of the Invention

[0003] The purpose of this invention is to provide a wide-temperature-range gas-liquid phase change measurement device, which solves the problem that traditional gas-liquid phase change measurement devices cannot simultaneously achieve both extremely low temperature reachability and wide-temperature-range stability.

[0004] The above-mentioned technical objective of the present invention is achieved through the following technical solution: A wide-temperature-range gas-liquid phase change measurement device includes a channel steel base plate and a phase change measurement container. A radiating bottom shell, a temperature control system, and a material conveying system are arranged side by side on the channel steel base plate. A radiating end shell is detachably connected to the top of the radiating bottom shell. The phase change measurement container is centrally located within the sealed space enclosed by the radiating bottom shell and the radiating end shell. The material conveying system passes through the radiating bottom shell and the radiating end shell and is connected to the phase change measurement container. The temperature control system is connected to the radiating bottom shell and the radiating end shell.

[0005] Preferably, the radiating bottom shell is provided with an upward-opening lower receiving groove, in which a first inner cylinder is provided. A first reinforcing ring and a second reinforcing ring are respectively fixed to the inner edges of the upper and lower ends of the first inner cylinder. A first copper plate is fixed between the first reinforcing ring and the second reinforcing ring. A first heat exchange copper tube is welded to the side of the first copper plate away from the phase change measuring container. A lower plate is fixedly connected to the bottom end of the second reinforcing ring. The lower plate is fixed to the upper side of the channel steel base plate. A second copper plate is fixedly connected to the upper end surface of the second reinforcing ring. A second heat exchange copper tube is welded to the side of the second copper plate away from the phase change measuring container. Multiple supporting ribs are fixedly connected between the lower plate and the second copper plate.

[0006] Preferably, the radiating end shell is provided with an upper receiving groove with an opening facing downwards. A second inner cylinder is provided in the upper receiving groove. A third reinforcing ring and a fourth reinforcing ring are respectively fixed to the inner edges of the upper and lower ends of the second inner cylinder. A third copper plate is fixed between the third reinforcing ring and the fourth reinforcing ring. A third heat exchange copper tube is welded to the side of the third copper plate away from the phase change measuring container. An upper plate is fixedly connected to the upper end face of the third reinforcing ring. Multiple hanging rods are fixedly connected between the upper plate and the radiating end shell. A fourth copper plate is clamped and fixed between the upper plate and the third reinforcing ring. A fourth heat exchange copper tube is welded to the side of the fourth copper plate away from the phase change measuring container.

[0007] Preferably, the diameter of the first inner cylinder is smaller than the diameter of the second inner cylinder, and their central axes coincide. The first copper plate, the second copper plate, the third copper plate, and the fourth copper plate together form a cylindrical structure.

[0008] Preferably, the bottom of the phase change measuring container is fixedly connected with multiple support feet, the bottom ends of which all pass through the second copper plate and are fixedly connected to the lower plate. The top of the phase change measuring container is fixedly embedded with at least one flange, and a volume measuring sensor is screwed onto the flange.

[0009] Preferably, the temperature control system includes a first flange pipe and a vacuum pipe fixedly embedded on the side wall of the radiant bottom shell, and a second flange pipe fixedly embedded on the side wall of the radiant end shell. A check valve is installed on the vacuum pipe. The first flange pipe is connected to a first heat exchange copper pipe and a second heat exchange copper pipe respectively through two corrugated hoses, and the first heat exchange copper pipe and the second heat exchange copper pipe are connected end to end. The second flange pipe is connected to a third heat exchange copper pipe and a fourth heat exchange copper pipe respectively through two corrugated hoses, and the third heat exchange copper pipe and the fourth heat exchange copper pipe are connected end to end.

[0010] Preferably, the feeding system includes a discharge pipe fixedly embedded in the side wall of the radiating bottom shell and at least one feeding pipe, wherein one end of the discharge pipe passes through the first inner cylinder and is fixedly embedded at the lowest point of the phase change measuring container, and one end of the feeding pipe passes through the first inner cylinder and is fixedly embedded on the top surface of the phase change measuring container.

[0011] Preferably, a plurality of columns are equidistantly arranged on the channel steel base plate and around the radiating bottom shell. A connecting plate is fixedly sleeved on the outer side of each column. An upper assembly ring is fixedly connected between the connecting plates. A lower assembly ring is fixedly screwed on the lower side of the upper assembly ring. The upper assembly ring is fixedly sleeved on the outer side of the radiating end shell, and the lower assembly ring is fixedly sleeved on the outer side of the radiating bottom shell.

[0012] Beneficial effects: In this invention, a wide-temperature-range gas-liquid phase change measurement device uses a welded structure of copper tubes and copper plates as a "heat sink" that directly surrounds the container. This structure has high thermal conductivity, large heat capacity, and fast temperature response, allowing the cooling / heating of the refrigerant (liquid nitrogen -173℃ or other low-temperature liquefied gases) to be evenly distributed across the entire outer wall of the container, thereby maximizing the uniformity of temperature control. The vacuum jacket completely cuts off gas heat conduction, and the columnar structure formed by the copper plates approximates a suspension structure, eliminating contact thermal resistance. This allows for long-term constant temperature control at both low and high temperatures, truly balancing extreme low-temperature accessibility with wide-temperature-range stability, providing an unprecedented temperature platform for high-precision gas-liquid phase change measurement. Attached Figure Description

[0013] Figure 1 A three-dimensional view of a wide-temperature-range gas-liquid phase change measurement device; Figure 2 This is a top cross-sectional view of a wide-temperature-range gas-liquid phase change measurement device; Figure 3 A side cross-sectional view of a wide-temperature-range gas-liquid phase change measurement device; Figure 4 A partial cross-sectional view of a wide-temperature-range gas-liquid phase change measurement device; Figure 5 A heat sink structure surrounding the container in a wide-temperature-range gas-liquid phase change measurement device. Figure 1 ; Figure 6 A heat sink structure surrounding the container in a wide-temperature-range gas-liquid phase change measurement device. Figure 2 .

[0014] Figure label: 1. Channel steel base plate; 2. Phase change measuring container; 3. Radiating bottom shell; 4. Temperature control system; 5. Material conveying system; 6. Radiating end shell; 11. Column; 12. Connecting plate; 13. Upper assembly ring; 14. Lower assembly ring; 21. Support foot; 22. Flange; 23. Volume measuring sensor; 31. First inner cylinder; 32. First reinforcing ring; 33. Second reinforcing ring; 34. First copper plate; 35. First heat exchange copper tube; 36. Lower plate 37. Second copper plate; 38. Second heat exchange copper tube; 39. Support rib; 41. First flange tube; 42. Second flange tube; 43. Vacuum tube; 44. Check valve; 51. Discharge pipe; 52. Conveyor pipe; 61. Second inner cylinder; 62. Third reinforcing ring; 63. Fourth reinforcing ring; 64. Third copper plate; 65. Third heat exchange copper tube; 66. Upper plate; 67. Hanger rod; 68. Fourth copper plate; 69. Fourth heat exchange copper tube. Detailed Implementation

[0015] The following description is merely a preferred embodiment of the present invention, and the scope of protection is not limited to this embodiment. All technical solutions falling within the scope of the present invention should be considered within the protection scope of the present invention. It should also be noted that for those skilled in the art, any improvements and modifications made without departing from the principles of the present invention should also be considered within the protection scope of the present invention.

[0016] like Figure 1-6 As shown, a wide-temperature-range gas-liquid phase change measurement device includes a channel steel base plate 1 and a phase change measurement container 2. A radiant bottom shell 3, a temperature control system 4, and a material conveying system 5 are arranged side by side on the channel steel base plate 1. A radiant end shell 6 is detachably connected to the top of the radiant bottom shell 3. A plurality of columns 11 are equidistantly arranged on the channel steel base plate 1 and around the radiant bottom shell 3. A connecting plate 12 is fixedly sleeved on the outer side of each column 11. An upper assembly ring 13 is fixedly connected between the connecting plates 12. A lower assembly ring 14 is fixedly screwed on the lower side of the upper assembly ring 13. The upper assembly ring 13 is fixedly sleeved on the outer side of the radiant end shell 6, and the lower assembly ring 14 is fixedly sleeved on the outer side of the radiant bottom shell 3. Specifically, after the upper assembly ring 13 and the lower assembly ring 14 are tightened with screws, radial clamping forces are applied to the radiating end shell 6 and the radiating bottom shell 3 respectively, so that the upper and lower half shells are precisely coaxially positioned and the sealing surface is pressed tightly. This not only resists the axial and radial loads caused by vacuuming and internal pressure changes, but also ensures that the radiating end shell 6 and the radiating bottom shell 3 can still be aligned and reset at one time after repeated disassembly and assembly, so as to achieve rapid assembly and reliable sealing.

[0017] Furthermore, the phase change measurement container 2 is centrally located within the enclosed space enclosed by the radiating bottom shell 3 and the radiating end shell 6. The bottom end of the phase change measurement container 2 is fixedly connected to multiple support feet 21. The bottom ends of the support feet 21 all pass through the second copper plate 37 and are fixedly connected to the lower plate 36. The top end of the phase change measurement container 2 is fixedly embedded with at least one flange 22. A volume measurement sensor 23 is screwed onto the flange 22. Specifically, the support foot 21 directly transmits the gravity of the phase change measurement container 2 to the channel steel base plate 1 via the lower plate 36. The volume measurement sensor 23 can monitor the volume change caused by the gas-liquid phase change of the test liquid under controlled temperature conditions in real time and accurately, and convert this physical signal into a recordable electrical signal output, providing a direct measurement basis for subsequent acquisition of key thermodynamic data such as saturated vapor pressure and latent heat. Preferably, thermocouples can be used for volume measurement. Thermocouples themselves cannot directly "detect volume". By arranging multiple calibrated thermocouples equidistantly along the axial direction of the container or viewing window, the temperature at each point is recorded in real time. When the liquid level drops as the temperature rises, a significant temperature gradient jump will appear at the liquid-gas interface. By identifying the location of this jump point, the current liquid level height can be determined. Combined with the known inner diameter and total height of the container, the volume occupied by the liquid phase and the gas phase can be calculated according to geometric relationships. Furthermore, by using the pressure and temperature data measured simultaneously, the gas phase density can be obtained through the equation of state, thereby completing the quantitative analysis of volume change during the gas-liquid phase change process.

[0018] Furthermore, the radiating bottom shell 3 is provided with an upward-opening lower receiving groove, in which a first inner cylinder 31 is provided. A first reinforcing ring 32 and a second reinforcing ring 33 are respectively fixed to the inner edges of the upper and lower ends of the first inner cylinder 31. A first copper plate 34 is fixed between the first reinforcing ring 32 and the second reinforcing ring 33. A first heat exchange copper tube 35 is welded to the side of the first copper plate 34 away from the phase change measuring container 2. A lower plate 36 is fixedly connected to the bottom end of the second reinforcing ring 33. The lower plate 36 is fixed to the upper side of the channel steel base plate 1. A second copper plate 37 is fixedly connected to the upper end surface of the second reinforcing ring 33. A second heat exchange copper tube 38 is welded to the side of the second copper plate 37 away from the phase change measuring container 2. A plurality of supporting ribs 39 are fixedly connected between the lower plate 36 and the second copper plate 37. Specifically, the temperature control medium circulating inside the first heat exchange copper tube 35 and the second heat exchange copper tube 38 has its cold or heat transferred quickly and evenly laterally through the first copper plate 34 and the second copper plate 37 welded to it, and directly radiated to the lower outer wall of the phase change measuring container 2 that it surrounds, thanks to the extremely high thermal conductivity of copper. It is worth noting that both the first heat exchange copper tube 35 and the second heat exchange copper tube 38 have a tortuous structure to increase their heat exchange area with the copper plate.

[0019] Furthermore, the radiating end shell 6 is provided with an upper receiving groove with an opening facing downwards. A second inner cylinder 61 is provided in the upper receiving groove. A third reinforcing ring 62 and a fourth reinforcing ring 63 are respectively fixed to the inner edges of the upper and lower ends of the second inner cylinder 61. A third copper plate 64 is fixed between the third reinforcing ring 62 and the fourth reinforcing ring 63. A third heat exchange copper tube 65 is welded to the side of the third copper plate 64 away from the phase change measuring container 2. An upper plate 66 is fixedly connected to the upper end face of the third reinforcing ring 62. A plurality of hanging rods 67 are fixedly connected between the upper plate 66 and the radiating end shell 6. A fourth copper plate 68 is clamped and fixed between the upper plate 66 and the third reinforcing ring 62. A fourth heat exchange copper tube 69 is welded to the side of the fourth copper plate 68 away from the phase change measuring container 2. Specifically, the temperature control medium circulating inside the third heat exchange copper tube 65 and the fourth heat exchange copper tube 69 carries cold or heat energy which is rapidly and evenly spread laterally and directly radiated to the upper outer wall of the phase change measuring container 2 surrounded by the directly welded third copper plate 64 and fourth copper plate 68, thanks to the extremely high thermal conductivity of copper. It is worth noting that both the third heat exchange copper tube 65 and the fourth heat exchange copper tube 69 have a tortuous structure to increase their heat exchange area with the copper plate.

[0020] Furthermore, the diameter of the first inner cylinder 31 is smaller than the diameter of the second inner cylinder 61, and their central axes coincide with each other. The first copper plate 34, the second copper plate 37, the third copper plate 64, and the fourth copper plate 68 together form a cylindrical structure. Specifically, by keeping the smaller diameter first inner cylinder 31 and the larger diameter second inner cylinder 61 coaxially nested, a uniform temperature control environment is created for the internal phase change measurement container 2. Since copper has an extremely high thermal conductivity, and each copper plate is directly connected to the first heat exchange copper tube 35, the second heat exchange copper tube 38, the third heat exchange copper tube 65 and the fourth heat exchange copper tube 69 welded to its back, the temperature change of the refrigerant or heat medium circulating in the copper tube can be uniformly transferred to the entire container surface with almost no delay or attenuation, achieving rapid temperature response and precise temperature control. The gap between the first inner cylinder 31 and the second inner cylinder 61 is conducive to vacuuming and vacuum insulation.

[0021] Furthermore, the material conveying system 5 passes through the radiating bottom shell 3 and the radiating end shell 6 and is connected to the phase change measuring container 2. The material conveying system 5 includes a discharge pipe 51 fixedly embedded on the side wall of the radiating bottom shell 3 and at least one material conveying pipe 52. One end of the discharge pipe 51 passes through the first inner cylinder 31 and is fixedly embedded at the lowest point of the phase change measuring container 2. One end of the material conveying pipe 52 passes through the first inner cylinder 31 and is fixedly embedded on the top surface of the phase change measuring container 2. Specifically, before the experiment, the feed pipe 52 passes through the side wall of the radiating bottom shell 3, through the first inner cylinder 31 and directly to the top of the phase change measuring container 2, so that the liquid can be quantitatively and steadily injected into the container. After the liquid level reaches the set height, the feed is stopped and the valve is closed. After the experiment, the discharge pipe 51 is opened. Since its inlet end is fixed at the lowest point of the container, the residual liquid can be completely discharged under the action of gravity.

[0022] Furthermore, the temperature control system 4 is connected to the radiant bottom shell 3 and the radiant end shell 6. The temperature control system 4 includes a first flange pipe 41 and a vacuum pipe 43 fixedly embedded on the side wall of the radiant bottom shell 3, and a second flange pipe 42 fixedly embedded on the side wall of the radiant end shell 6. A check valve 44 is installed on the vacuum pipe 43. The first flange pipe 41 is connected to the first heat exchange copper pipe 35 and the second heat exchange copper pipe 38 through two corrugated hoses, and the first heat exchange copper pipe 35 and the second heat exchange copper pipe 38 are connected end to end. The second flange pipe 42 is connected to the third heat exchange copper pipe 65 and the fourth heat exchange copper pipe 69 through two corrugated hoses, and the third heat exchange copper pipe 65 and the fourth heat exchange copper pipe 69 are connected end to end. Specifically, by circulating a low-temperature or high-temperature heat exchange medium into the first and second heat exchange copper tubes 35 and 38 (connected end-to-end), or by circulating a low-temperature or high-temperature heat exchange medium into the third and fourth heat exchange copper tubes 65 and 69 (connected end-to-end), a controllable radial radiation temperature zone is formed around the container by the first copper plate 34, the second copper plate 37, the third copper plate 64, and the fourth copper plate 68. The high thermal conductivity of the heat exchange copper tubes and copper plates rapidly and evenly transfers heat to the outer wall of the container, achieving continuous adjustment and high-precision constant temperature over a wide temperature range of -80℃ to +250℃. At the same time, the annular sealed space between the radiating bottom shell 3 and the radiating end shell 6 is continuously evacuated to ≤10℃ through the vacuum tube 43. -2 The high vacuum of Pa cuts off gas heat conduction and convection, forming a highly efficient vacuum insulation layer that minimizes heat exchange between the container and the outside environment.

[0023] Working principle: In use, the liquid to be tested is first injected into the phase change measuring container 2 through the feed pipe 52 until the liquid level is detected by the volume measuring sensor 23 to the set value. Then, the temperature control system 4 is activated, and a low temperature or high temperature heat exchange medium is circulated through the first flange pipe 41 to the first heat exchange copper tube 35 and the second heat exchange copper tube 38 connected end to end. At the same time, a heat exchange medium of the same temperature or opposite temperature is circulated through the second flange pipe 42 to the third heat exchange copper tube 65 and the fourth heat exchange copper tube 69 connected end to end, so that the first copper plate 34, the second copper plate 37, and the third copper plate 69 are connected end to end. Plate 64 and the fourth copper plate 68 form a controllable radial radiation temperature zone around the container. The high thermal conductivity of the heat exchange copper tubes and plates rapidly and evenly transfers heat to the outer wall of the container, achieving continuous adjustment and high-precision constant temperature over a wide temperature range of -80℃ to +250℃. When the temperature reaches the target value, the liquid undergoes a gas-liquid phase change within the container. The volume change during the phase change is captured in real time by the volume measurement sensor 23, which outputs a signal. Simultaneously, the annular sealed space between the radiating bottom shell 3 and the radiating end shell 6 is continuously evacuated to ≤10℃ through the vacuum tube 43. -2 The high vacuum of Pa cuts off gas heat conduction and convection, forming a highly efficient vacuum insulation layer, which suppresses heat exchange between the container and the outside world to the greatest extent, ensuring temperature field stability and measurement accuracy. After the reaction is completed, the discharge pipe 51 can be opened to discharge the residual liquid or condensate.

Claims

1. A wide-temperature-range gas-liquid phase change measurement device, comprising a channel steel substrate (1) and a phase change measurement container (2), characterized in that, A radiant bottom shell (3), a temperature control system (4), and a material conveying system (5) are arranged side by side on the channel steel base plate (1). A radiant end shell (6) is detachably connected to the top of the radiant bottom shell (3). The phase change measuring container (2) is centrally located in the closed space enclosed by the radiant bottom shell (3) and the radiant end shell (6). The material conveying system (5) passes through the radiant bottom shell (3) and the radiant end shell (6) and is connected to the phase change measuring container (2). The temperature control system (4) is connected to the radiant bottom shell (3) and the radiant end shell (6).

2. The wide-temperature-range gas-liquid phase change measuring device according to claim 1, characterized in that, The radiating bottom shell (3) is provided with an upward-opening lower receiving groove, in which a first inner cylinder (31) is provided. A first reinforcing ring (32) and a second reinforcing ring (33) are fixed to the inner edges of the upper and lower ends of the first inner cylinder (31), respectively. A first copper plate (34) is fixed between the first reinforcing ring (32) and the second reinforcing ring (33). A first heat exchange copper tube (35) is welded to the side of the first copper plate (34) away from the phase change measuring container (2). A lower plate (36) is fixedly connected to the bottom end of the second reinforcing ring (33). The lower plate (36) is fixed to the upper side of the channel steel base plate (1). A second copper plate (37) is fixedly connected to the upper end surface of the second reinforcing ring (33). A second heat exchange copper tube (38) is welded to the side of the second copper plate (37) away from the phase change measuring container (2). A plurality of supporting ribs (39) are fixedly connected between the lower plate (36) and the second copper plate (37).

3. The wide-temperature-range gas-liquid phase change measuring device according to claim 2, characterized in that, The radiating end shell (6) is provided with an upper receiving groove with an opening facing downward. A second inner cylinder (61) is provided in the upper receiving groove. A third reinforcing ring (62) and a fourth reinforcing ring (63) are fixed to the inner edges of the upper and lower ends of the second inner cylinder (61), respectively. A third copper plate (64) is fixed between the third reinforcing ring (62) and the fourth reinforcing ring (63). A third heat exchange copper tube (65) is welded to the side of the third copper plate (64) away from the phase change measuring container (2). An upper plate (66) is fixedly connected to the upper end face of the third reinforcing ring (62). A plurality of hanging rods (67) are fixedly connected between the upper plate (66) and the radiating end shell (6). A fourth copper plate (68) is clamped and fixed between the upper plate (66) and the third reinforcing ring (62). A fourth heat exchange copper tube (69) is welded to the side of the fourth copper plate (68) away from the phase change measuring container (2).

4. The wide-temperature-range gas-liquid phase change measuring device according to claim 3, characterized in that, The diameter of the first inner cylinder (31) is smaller than the diameter of the second inner cylinder (61), and their central axes coincide. The first copper plate (34), the second copper plate (37), the third copper plate (64), and the fourth copper plate (68) together form a cylindrical structure.

5. The wide-temperature-range gas-liquid phase change measuring device according to claim 1, characterized in that, The bottom of the phase change measuring container (2) is fixedly connected with multiple support feet (21). The bottom of each support foot (21) passes through the second copper plate (37) and is fixedly connected to the lower plate (36). The top of the phase change measuring container (2) is fixedly embedded with at least one flange (22). A volume measuring sensor (23) is screwed onto each flange (22).

6. The wide-temperature-range gas-liquid phase change measuring device according to claim 4, characterized in that, The temperature control system (4) includes a first flange pipe (41) and a vacuum pipe (43) fixedly embedded on the side wall of the radiant bottom shell (3) and two second flange pipes (42) fixedly embedded on the side wall of the radiant end shell (6). A check valve (44) is installed on the vacuum pipe (43). The first flange pipe (41) is connected to the third heat exchange copper pipe (65) and the fourth heat exchange copper pipe (69) respectively through two corrugated hoses. The third heat exchange copper pipe (65) and the fourth heat exchange copper pipe (69) are connected end to end. One second flange pipe (42) is connected to the first heat exchange copper pipe (35) end to end through two corrugated hoses. The other second flange pipe (42) is connected to the second heat exchange copper pipe (38) end to end through two corrugated hoses.

7. The wide-temperature-range gas-liquid phase change measuring device according to claim 1, characterized in that, The material conveying system (5) includes a discharge pipe (51) fixedly embedded on the side wall of the radiating bottom shell (3) and at least one material conveying pipe (52), wherein one end of the discharge pipe (51) passes through the first inner cylinder (31) and is fixedly embedded at the lowest point of the phase change measuring container (2), and one end of the material conveying pipe (52) passes through the first inner cylinder (31) and is fixedly embedded on the top surface of the phase change measuring container (2).

8. The wide-temperature-range gas-liquid phase change measuring device according to claim 1, characterized in that, Multiple columns (11) are equidistantly arranged on the channel steel base plate (1) and around the radiating bottom shell (3). A connecting plate (12) is fixedly sleeved on the outer side of each column (11). An upper assembly ring (13) is fixedly connected between the connecting plates (12). A lower assembly ring (14) is fixedly screwed on the lower side of the upper assembly ring (13). The upper assembly ring (13) is fixedly sleeved on the outer side of the radiating end shell (6), and the lower assembly ring (14) is fixedly sleeved on the outer side of the radiating bottom shell (3).

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